| CPC H01B 5/08 (2013.01) [B21C 1/02 (2013.01); B22D 11/004 (2013.01); B22D 11/006 (2013.01); C22C 9/00 (2013.01); C22C 9/04 (2013.01); C22C 19/03 (2013.01); C22F 1/10 (2013.01); C25D 5/50 (2013.01); C25D 7/04 (2013.01); C25D 7/0607 (2013.01)] | 10 Claims |
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1. A stranded wire conductor that maintains high strength and high conductivity in a high temperature environment, wherein the stranded wire conductor is composed of a plurality of composite wire monofilaments stranded together, the composite wire monofilament includes a nickel-tantalum-tungsten core wire, a conductive alloy tube wrapped around an outside of the nickel-tantalum-tungsten core wire, and a plating provided on an outside of the conductive alloy tube;
a composition of the nickel-tantalum-tungsten core wire includes 80% to 95% nickel, 0.5% to 10% tantalum, and 0.5% to 10% tungsten by weight, and a balance is trace impurities, an oxygen content of the nickel-tantalum-tungsten core wire is less than 9 ppm, a conductivity of the nickel-tantalum-tungsten core wire is in a range of 1% to 5%, and a tensile strength of the nickel-tantalum-tungsten core wire is not less than 1000 Mpa;
the conductive alloy tube is a copper-based or silver-based alloy tube;
a ratio of a cross-sectional area of a nickel-tantalum-tungsten alloy core wire in a composite wire to a total area of the composite wire is in a range of 20% to 40%;
before stranding, the composite wire monofilament has a tensile strength being greater than 440 MPa at 20° C., a conductivity being greater than 70%, and an elongation being greater than 6%; and
after stranding, the composite wire monofilament has a tensile strength being not less than 400 Mpa in a working environment at 600° C.
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